Valve actuator

Details Valve actuator Valve actuator

1978-10-17

1981-04-14

Husar, C. J.

Machine element or mechanism

Alternate manual or power operators

64 29, 192 8R, F16H 3318

Patent

active

042612241

ABSTRACT:
A valve actuator which is operable alternatively by a motor and manually. The motor is coupled into the drive train for the actuator through a planetary gear device so as to enable rapid actuation of the valve by the motor. The motor is coupled through a special one-way coupling to the sun-gear drive of the planetary assembly which permits the motor to drive the sun gear in either direction upon rotation of the motor but prevents rotation of the sun gear when the motor is arrested. A handwheel is coupled to the ring-gear drive of the planetary assembly through a worm and pinion so that the handwheel may then drive the ring gear under manual operation, but the ring gear is retained against rotation by the worm pinion when the handwheel is idle. The planet-gear drive serves as the normal output of the planetary assembly and is coupled to the valve spindle through a torque-limiting device. A position-limiting means is coupled to the valve spindle to arrest rotation of the motor at the opposite limit positions of the valve element. A torque-limiting sensor is coupled with the ring-gear drive to sense the torque transmitted or fed back through the planetary assembly, said torque-sensing device being adjustable to arrest the drive motor when the motor exceeds the said torque. The setting is independently adjustable for different directions of rotation of the drive motor.

REFERENCES:
patent: 2300023 (1942-10-01), Swartz
patent: 2597798 (1952-05-01), Houplain
patent: 2703991 (1955-03-01), Kron et al.
patent: 2745294 (1956-05-01), Kron
patent: 4092877 (1978-06-01), Ledeen et al.

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